Two Probability and statistics questions

[kevin1432]

Hi there! I cant solve these two questions. please help me to solve. thank you

 

[Deleted member 4993]

Hi there! I cant solve these two questions. please help me to solve. thank you

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Please show us what you have tried and exactly where you are stuck.

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View attachment 24596

 

[kevin1432]

ı couldn't make them at all.

 

[Deleted member 4993]

ı couldn't make them at all.

Okay then - we'll have to start from the very beginning and it'll take some effort.

Normal distribution require two parameters to describe. What are those?